Heat exchanger



FIG. 1 is a perspective view of a heat exchanger embodying the invention.

FIG. 2 is a perspective view of a portion of the heat exchanger of FIG. 1.

FIG. 3 is a right side view of the portion of the heat exchanger of FIG. 2.

FIG. 4 is a left side view of the portion of the heat exchanger of FIG. 2.

FIG. 5 is a front view of the portion of the heat exchanger of FIG. 2.

FIG. 6 is a rear view of the portion of the heat exchanger of FIG. 2.

FIG. 7 is a top view of the portion of the heat exchanger of FIG. 2.

FIG. 8 is a bottom view of the portion of the heat exchanger of FIG. 2; and,

FIG. 9 is a close-up perspective view of the heat exchanger of FIG. 2.

The elements shown in broken lines are included for the purpose of illustrating environment and form no part of the claimed design. The portions shown in broken lines having unequal length segments illustrate the boundary of the claimed design and form no part of the claimed design. 

CLAIM We claim the ornamental design for a heat exchanger, as shown and described. 